【5G核心网】 free5gc Network Triggered Service Request源码分析

你的名字 2022-12-22 13:29 801阅读 0赞

本文分析 free5gc Network Triggered Service Request 网络触发的业务请求流程。当网络侧需要向 UE 发出信号时（例如向 UE 发出 N1 信令，移动端应用等推送（比如视频，微信），对 PDU 会话的用户平面连接激活以传递移动端用户数据），将使用此过程。

# 1. UPF 向 SMF 发送 PFCP Sesssion Report request #

UP 功能应使用 PFCP Session Report 流程将与 PFCP 会话有关的信息报告给 CP 功能。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70][] UPF -> SMF PFCP Session Report request

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 1][] UPF->SMF PFCP Session Report request

###    1.1 SMF 处理 PFCP Sesssion Report request ###

func HandlePfcpSessionReportRequest(msg *pfcpUdp.Message) {
    	req := msg.PfcpMessage.Body.(pfcp.PFCPSessionReportRequest)
    
    	SEID := msg.PfcpMessage.Header.SEID
    	smContext := smf_context.GetSMContextBySEID(SEID)
    	seqFromUPF := msg.PfcpMessage.Header.SequenceNumber

目前只实现类型为 DLDR（Downlink Data Report）

if req.ReportType.Dldr {
    	downlinkDataReport := req.DownlinkDataReport
    	pdrID := downlinkDataReport.PDRID.RuleId
    
    	if downlinkDataReport.DownlinkDataServiceInformation != nil {
    		logger.PfcpLog.Warnf("PFCP Session Report Request DownlinkDataServiceInformation handling is not implemented")
    	}

如果 SM 上下文的 PDR ID 相同则发送 PFCP Session Report response

ANUPF := smContext.Tunnel.DataPathPool.GetDefaultPath().FirstDPNode
    DLPDR := ANUPF.DownLinkTunnel.PDR
    if DLPDR.PDRID == pdrID {
    	// TS 23.502 4.2.3.3 2b. Send Data Notification Ack, SMF->UPF
    	cause.CauseValue = pfcpType.CauseRequestAccepted
    	// TODO fix: SEID should be the value sent by UPF but now the SEID value is from sm context
    	pfcp_message.SendPfcpSessionReportResponse(msg.RemoteAddr, cause, seqFromUPF, SEID)

BuildPDUSessionResourceSetupRequestTransfer 函数创建 NGAP 消息，包括：

*    UL-NGU-UP-TNLInformation
 *    PDUSessionType
 *    QosFlowSetupRequestList

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 2][] N1N2消息中的NGAP

SMF 向 AMF 发送 N1N2 请求 /ue-contexts/\{ueContextId\}/n1-n2-messages

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 3][] SMF->AMF /ue-contexts/\{ueContextId\}/n1-n2-messages

# 2. AMF 处理 N1N2 消息 #

// TS23502 4.2.3.3, 4.2.4.3, 4.3.2.2, 4.3.2.3, 4.3.3.2, 4.3.7
    func HandleN1N2MessageTransferRequest(request *http_wrapper.Request) *http_wrapper.Response {
    
    	logger.ProducerLog.Infof("Handle N1N2 Message Transfer Request")
    
    	n1n2MessageTransferRequest := request.Body.(models.N1N2MessageTransferRequest)
    	ueContextID := request.Params["ueContextId"]
    	reqUri := request.Params["reqUri"]

###    2.1 N1N2MessageTransferProcedure 函数 ###

// There are 4 possible return value for this function:
    //   - n1n2MessageTransferRspData: if AMF handle N1N2MessageTransfer Request successfully.
    //   - locationHeader: if response status code is 202, then it will return a non-empty string location header for
    //     response
    //   - problemDetails: if AMF reject the request due to application error, e.g. UE context not found.
    //   - TransferErr: if AMF reject the request due to procedure error, e.g. UE has an ongoing procedure.
    // see TS 29.518 6.1.3.5.3.1 for more details.
    func N1N2MessageTransferProcedure(ueContextID string, reqUri string,
    	n1n2MessageTransferRequest models.N1N2MessageTransferRequest) (
    	n1n2MessageTransferRspData *models.N1N2MessageTransferRspData,
    	locationHeader string, problemDetails *models.ProblemDetails,
    	transferErr *models.N1N2MessageTransferError) {

**   2.1.1 UE 处于 CM-IDLE 状态**

将 onGoing 设置为 Paging，BuildPaging 创建 NGAP 消息，向 RAN 发送

// Case A (UE is CM-IDLE in 3GPP access and the associated access type is 3GPP access)
    // in subclause 5.2.2.3.1.2 of TS29518
    if anType == models.AccessType__3_GPP_ACCESS {
    	if requestData.SkipInd && n2Info == nil {
    		n1n2MessageTransferRspData.Cause = models.N1N2MessageTransferCause_N1_MSG_NOT_TRANSFERRED
    	} else {
    		n1n2MessageTransferRspData.Cause = models.N1N2MessageTransferCause_ATTEMPTING_TO_REACH_UE
    		message := context.N1N2Message{
    			Request:     n1n2MessageTransferRequest,
    			Status:      n1n2MessageTransferRspData.Cause,
    			ResourceUri: locationHeader,
    		}
    		ue.N1N2Message = &message
    		onGoing.Procedure = context.OnGoingProcedurePaging
    		onGoing.Ppi = requestData.Ppi
    		if onGoing.Ppi != 0 {
    			pagingPriority = new(ngapType.PagingPriority)
    			pagingPriority.Value = aper.Enumerated(onGoing.Ppi)
    		}
    		pkg, err := ngap_message.BuildPaging(ue, pagingPriority, false)
    		if err != nil {
    			logger.NgapLog.Errorf("Build Paging failed : %s", err.Error())
    			return n1n2MessageTransferRspData, locationHeader, problemDetails, transferErr
    		}
    		ngap_message.SendPaging(ue, pkg)
    	}
    	// TODO: WAITING_FOR_ASYNCHRONOUS_TRANSFER
    	return n1n2MessageTransferRspData, locationHeader, problemDetails, transferErr
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 4][] AMF->AN NGAP Paging

AMF 回复 SMF N1N2 消息，cause 设置为 ATTEMPTING\_TO\_REACH\_UE

n1n2MessageTransferRspData, locationHeader, problemDetails, transferErr := N1N2MessageTransferProcedure(
    	ueContextID, reqUri, n1n2MessageTransferRequest)
    
    if n1n2MessageTransferRspData != nil {
    	switch n1n2MessageTransferRspData.Cause {
    	case models.N1N2MessageTransferCause_N1_MSG_NOT_TRANSFERRED:
    		fallthrough
    	case models.N1N2MessageTransferCause_N1_N2_TRANSFER_INITIATED:
    		return http_wrapper.NewResponse(http.StatusOK, nil, n1n2MessageTransferRspData)
    	case models.N1N2MessageTransferCause_ATTEMPTING_TO_REACH_UE:
    		headers := http.Header{
    			"Location": {locationHeader},
    		}
    		return http_wrapper.NewResponse(http.StatusAccepted, headers, n1n2MessageTransferRspData)
    	}
    }

# 3.  UE 向 AMF 发送 Service request #

NAS mm 消息类型设置为 ***MsgTypeServiceRequest***，业务请求类型设置为 ***Mobile terminated services***

***   *** NGAP 消息设置 Present 为 NGAPPDUPresentInitiatingMessage，ProcedureCodeInitialUEMessage，InitiatingMessagePresentInitialUEMessage

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 5][] InitialUEMessage，Service request

# 3. AMF 处理 Service request #

func HandleInitialUEMessage(ran *context.AmfRan, message *ngapType.NGAPPDU) {
    
    	amfSelf := context.AMF_Self()
    
    	var rANUENGAPID *ngapType.RANUENGAPID
    	var nASPDU *ngapType.NASPDU
    	var userLocationInformation *ngapType.UserLocationInformation
    	var rRCEstablishmentCause *ngapType.RRCEstablishmentCause
    	var fiveGSTMSI *ngapType.FiveGSTMSI
    	// var aMFSetID *ngapType.AMFSetID
    	var uEContextRequest *ngapType.UEContextRequest
    	// var allowedNSSAI *ngapType.AllowedNSSAI

由于 AMF 已经释放了 UE 上下文，需要重新实例化。

ranUe := ran.RanUeFindByRanUeNgapID(rANUENGAPID.Value)
    if ranUe != nil && ranUe.AmfUe == nil {
    	err := ranUe.Remove()
    	if err != nil {
    		Ngaplog.Errorln(err.Error())
    	}
    	ranUe = nil
    }
    if ranUe == nil {
    	var err error
    	ranUe, err = ran.NewRanUe(rANUENGAPID.Value)
    	if err != nil {
    		logger.NgapLog.Errorf("NewRanUe Error: %+v", err)
    	}
    	Ngaplog.Debugf("New RanUe [RanUeNgapID: %d]", ranUe.RanUeNgapId)

包含 GSTMSI， <5G-S-TMSI> := <AMF Set ID><AMF Pointer><5G-TMSI>

### **   3.1 HandleServiceRequest 函数** ###

// TS 24501 5.6.1
    func HandleServiceRequest(ue *context.AmfUe, anType models.AccessType,
    	serviceRequest *nasMessage.ServiceRequest) error {
    	logger.GmmLog.Info("Handle Service Reqeust")
    
    	if ue == nil {
    		return fmt.Errorf("AmfUe is nil")
    	}
    
    	util.StopT3513(ue)
    	util.StopT3565(ue)

AMF 含有 UE 安全上下文，无须在发起

// Send Authtication / Security Procedure not support
    if !ue.SecurityContextIsValid() {
    	logger.GmmLog.Warnf("No Security Context : SUPI[%s]", ue.Supi)
    	gmm_message.SendServiceReject(ue.RanUe[anType], nil, nasMessage.Cause5GMMUEIdentityCannotBeDerivedByTheNetwork)
    	ngap_message.SendUEContextReleaseCommand(ue.RanUe[anType],
    		context.UeContextN2NormalRelease, ngapType.CausePresentNas, ngapType.CauseNasPresentNormalRelease)
    	return nil
    }

根据网络触发请求的 N1N2 消息得到 PDU 会话 ID

if ue.N1N2Message != nil {
    	requestData := ue.N1N2Message.Request.JsonData
    	if ue.N1N2Message.Request.BinaryDataN2Information != nil {
    		if requestData.N2InfoContainer.N2InformationClass == models.N2InformationClass_SM {
    			targetPduSessionId = requestData.N2InfoContainer.SmInfo.PduSessionId
    		} else {
    			ue.N1N2Message = nil
    			return fmt.Errorf("Service Request triggered by Network has not implemented about non SM N2Info")
    		}
    	}
    }

**3.1.1 网络侧触发的业务请求**

**    **类型为  ***ServiceTypeMobileTerminatedServices***

switch serviceType {
    case nasMessage.ServiceTypeMobileTerminatedServices: // Trigger by Network
    	if ue.N1N2Message != nil {
    		requestData := ue.N1N2Message.Request.JsonData
    		n1Msg := ue.N1N2Message.Request.BinaryDataN1Message
    		n2Info := ue.N1N2Message.Request.BinaryDataN2Information

3.1.1.1 如果是网络侧触发的信令消息，则发送 Service Accept，其他先不关心，直接过

// downlink signalling
    if n2Info == nil {
    	err := sendServiceAccept(ue, anType, ctxList, suList, acceptPduSessionPsi,
    		reactivationResult, errPduSessionId, errCause)
    	if err != nil {
    		return err
    	}
    	switch requestData.N1MessageContainer.N1MessageClass {
    	case models.N1MessageClass_SM:
    		gmm_message.SendDLNASTransport(ue.RanUe[anType],
    			nasMessage.PayloadContainerTypeN1SMInfo, n1Msg, requestData.PduSessionId, 0, nil, 0)
    	case models.N1MessageClass_LPP:
    		gmm_message.SendDLNASTransport(ue.RanUe[anType], nasMessage.PayloadContainerTypeLPP, n1Msg, 0, 0, nil, 0)
    	case models.N1MessageClass_SMS:
    		gmm_message.SendDLNASTransport(ue.RanUe[anType], nasMessage.PayloadContainerTypeSMS, n1Msg, 0, 0, nil, 0)
    	case models.N1MessageClass_UPDP:
    		gmm_message.SendDLNASTransport(ue.RanUe[anType], nasMessage.PayloadContainerTypeUEPolicy, n1Msg, 0, 0, nil, 0)
    	}
    	ue.N1N2Message = nil
    	return nil
    }

3.1.1.2 这里暂且不讨论非 3GPP

if smContext.PduSessionContext.AccessType == models.AccessType_NON_3_GPP_ACCESS {
    	if serviceRequest.AllowedPDUSessionStatus != nil {
    		allowPduSessionPsi := nasConvert.PSIToBooleanArray(serviceRequest.AllowedPDUSessionStatus.Buffer)
    		if reactivationResult == nil {
    			reactivationResult = new([16]bool)
    		}

3.1.1.3 如果 N1N2 消息 NGAP 类型为 NgapIeType\_PDU\_RES\_SETUP\_REQ

N1N2 消息只有 N2 消息，AppendPDUSessionResourceSetupListCxtReq 函数主要是增加 IE 信息，包括 PDUSessionID，SNSSAI，nasPDU，PDUSessionResourceSetupRequestTransfer

else if smInfo.N2InfoContent.NgapIeType == models.NgapIeType_PDU_RES_SETUP_REQ {
    	var nasPdu []byte
    	var err error
    	if n1Msg != nil {
    		pduSessionId := uint8(smInfo.PduSessionId)
    		nasPdu, err = gmm_message.BuildDLNASTransport(ue, nasMessage.PayloadContainerTypeN1SMInfo,
    			n1Msg, pduSessionId, nil, nil, 0)
    		if err != nil {
    			return err
    		}
    	}
    	if ue.RanUe[anType].UeContextRequest {
    		ngap_message.AppendPDUSessionResourceSetupListCxtReq(&ctxList, smInfo.PduSessionId, *smInfo.SNssai, nasPdu, n2Info)
    	} else {
    		ngap_message.AppendPDUSessionResourceSetupListSUReq(&suList, smInfo.PduSessionId, *smInfo.SNssai,
    			nasPdu, n2Info)
    	}
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 6][] PDUSessionResourceSetupItemCtxReq

3.1.1.4 AMF 向 UE 发送 Service Accept 消息

BuildServiceAccept 函数创建 NAS mm 消息，类型为 ***MsgTypeServiceAccept***

func sendServiceAccept(ue *context.AmfUe, anType models.AccessType, ctxList ngapType.PDUSessionResourceSetupListCxtReq,
    	suList ngapType.PDUSessionResourceSetupListSUReq, pDUSessionStatus *[16]bool,
    	reactivationResult *[16]bool, errPduSessionId, errCause []uint8) error {
    	if ue.RanUe[anType].UeContextRequest {
    		// update Kgnb/Kn3iwf
    		ue.UpdateSecurityContext(anType)
    
    		nasPdu, err := gmm_message.BuildServiceAccept(ue, pDUSessionStatus, reactivationResult,
    			errPduSessionId, errCause)
    		if err != nil {
    			return err
    		}
    		if len(ctxList.List) != 0 {
    			ngap_message.SendInitialContextSetupRequest(ue, anType, nasPdu, &ctxList, nil, nil, nil)
    		} else {
    			ngap_message.SendInitialContextSetupRequest(ue, anType, nasPdu, nil, nil, nil, nil)
    		}

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 7][] NAS-PDU

3.1.1.4.1 SendInitialContextSetupRequest 函数

发送 Initial Context Setup Request，BuildInitialContextSetupRequest 包括如下一堆 IE 信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 8][] InitialContextSetupRequest，Service accept

# 4. 向 AMF 发送 Initial Context Setup Response #

if pDUSessionResourceSetupResponseList != nil {
    	Ngaplog.Trace("[NGAP] Send PDUSessionResourceSetupResponseTransfer to SMF")
    
    	for _, item := range pDUSessionResourceSetupResponseList.List {
    		pduSessionID := int32(item.PDUSessionID.Value)
    		transfer := item.PDUSessionResourceSetupResponseTransfer
    
    		// response, _, _, err := consumer.SendUpdateSmContextN2Info(amfUe, pduSessionID,
    		_, _, _, err := consumer.SendUpdateSmContextN2Info(amfUe, pduSessionID,
    			models.N2SmInfoType_PDU_RES_SETUP_RSP, transfer)
    		if err != nil {
    			Ngaplog.Errorf("SendUpdateSmContextN2Info[PDUSessionResourceSetupResponseTransfer] Error:\n%s", err.Error())
    		}
    		// RAN initiated QoS Flow Mobility in subclause 5.2.2.3.7
    		// if response != nil && response.BinaryDataN2SmInformation != nil {
    		// TODO: n2SmInfo send to RAN
    		// } else if response == nil {
    		// TODO: error handling
    		// }
    	}
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 9][] InitialContextSetupResponse

###    4.1 AMF 处理 Initial Context Setup Response ###

func HandleInitialContextSetupResponse(ran *context.AmfRan, message *ngapType.NGAPPDU) {
    
    	var aMFUENGAPID *ngapType.AMFUENGAPID
    	var rANUENGAPID *ngapType.RANUENGAPID
    	var pDUSessionResourceSetupResponseList *ngapType.PDUSessionResourceSetupListCxtRes
    	var pDUSessionResourceFailedToSetupList *ngapType.PDUSessionResourceFailedToSetupListCxtRes
    	var criticalityDiagnostics *ngapType.CriticalityDiagnostics

如果存在 PDU 会话资源则调用 SendUpdateSmContextN2Info 向 SMF 发送更新上下文请求，设置的 n2SmInfoType 为 N2SmInfoType\_PDU\_RES\_SETUP\_RSP，包括 PDUSessionResourceSetupResponseTransfer，/sm-contexts/\{smContextRef\}/modify

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 10][] AMF -> SMF Update SM Context

# 5. SMF 处理更新上下文请求 #

func HandlePDUSessionSMContextUpdate(smContextRef string, body models.UpdateSmContextRequest) *http_wrapper.Response {
    	//GSM State
    	//PDU Session Modification Reject(Cause Value == 43 || Cause Value != 43)/Complete
    	//PDU Session Release Command/Complete
    	logger.PduSessLog.Infoln("In HandlePDUSessionSMContextUpdate")
    	smContext := smf_context.GetSMContext(smContextRef)

###    5.1 根据 N2 Sm 信息类型为 PDU\_RES\_SETUP\_RSP ###

switch smContextUpdateData.N2SmInfoType {
    case models.N2SmInfoType_PDU_RES_SETUP_RSP:
    	if smContext.SMContextState != smf_context.Active {
    		//Wait till the state becomes Active again
    		//TODO: implement sleep wait in concurrent architecture
    		logger.PduSessLog.Infoln("The SMContext State should be Active State")
    		logger.PduSessLog.Infoln("SMContext state: ", smContext.SMContextState.String())
    	}
    	smContext.SMContextState = smf_context.ModificationPending
    	logger.CtxLog.Traceln("SMContextState Change State: ", smContext.SMContextState.String())
    	pdrList = []*smf_context.PDR{}
    	farList = []*smf_context.FAR{}

HandlePDUSessionResourceSetupResponseTransfer 函数根据 PDUSessionResourceSetupResponseTransfer 信息设置 Outer Heade Creation，主要是把下行的 N3 重新建起来

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pob25nbGluemhhbmc_size_16_color_FFFFFF_t_70 11][] PFCP Session Modification Request

SendPfcpSessionModificationRequest 向 UPF 发送 PFCP Session Modification 请求

var httpResponse *http_wrapper.Response
    //Check FSM and take corresponding action
    switch smContext.SMContextState {
    case smf_context.PFCPModification:
    	logger.CtxLog.Traceln("In case PFCPModification")
    
    	if sendPFCPModification {
    		defaultPath := smContext.Tunnel.DataPathPool.GetDefaultPath()
    		ANUPF := defaultPath.FirstDPNode
    		pfcp_message.SendPfcpSessionModificationRequest(ANUPF.UPF.NodeID, smContext, pdrList, farList, barList)
    	}
    
    	if sendPFCPDelete {
    		logger.PduSessLog.Infoln("Send PFCP Deletion from HandlePDUSessionSMContextUpdate")
    	}
    
    	PFCPResponseStatus := <-smContext.SBIPFCPCommunicationChan

UPF -> SMF -> AMF 都成功，OVER

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